undervolting in ubuntu

[Blackbug]

I need to know if i can undervolt my CPU in ubuntu.
I know softwares with which i can do the same in windows.
how to do it in ubunut?

[tgalati4]

You need to recompile your kernel in linux with P-States Voltage Control set to "on". Takes about 2 hours to recompile my kernel on Jaunty using a thinkpad T43p. Then you can use a panel widget PHCTool to undervolt. There are several threads in the forums on how to do it. Only certain processors support undervolting.